Objective To evaluate the clinical value of CT three-dimensional(3-D) imaging on diagnosing of bone and joint diseases.Methods The imaging findings of 357 cases proved by operation or clinic were analyzed retrospectively by the 3-D imaging.The diagnosis accuracy of 3-D imaging was compared with that of routine CT.3-D images were obtained by surface shade display(SSD),multi-planar reconstruction(MPR),maximum intensity project(MIP) and volume rendering(VR).Results In 357 patients,257 cases were traumatic disease,100 cases were non-traumatic disease.The diagnosis accuracy of 3-D imaging was 98.3%,which was higher than that of routine CT(P

ObjectiveTo valuate the three-dimensional CT angiography(3DCTA) in diagnosing blood vessel diseases.MethodsCTA findings of 284 patients confirmed with blood vessel diseases were retrospectively analyzed.They were divided into two groups:141 cases of head and neck and 143 cases of trunk and extremities.Scan was performed with the beam collimation of 0.625 ～ 3.0mm,increment of 0.3 ～ 1.4mm,pitch of 1.0 ～ 1.5,with the gross contrast medium of 1.5 ～ 2.0ml/kg.3D imaging methods included volume rendering(VR),multi-planar reformatting (MPR),curved planar reformatting(CPR),surface shade display(SSD),maximum intensity project(MIP) and virtual endoscopy(VE).The diagnostic results of CTA were compared with those of DSA and/or surgery.ResultsIn this study,3D images of vasculature met the diagnostic criterion.The diagnostic sensitivity,specificity and accuracy of CTA was 97.28％,82.35％ and 96.48％,respectively.The size of artery aneurysm shown with CTA and DSA had no significant difference( P ＞0.05 ),both smaller than that in surgery( P ＜ 0.05 ).Conclusion3DCTA could be used in diagnosing the cardiovascular diseases and compensate the limitation of conventional CT.It had the characteristics of non-invasion,high accuracy and could partly substitute DSA.

Objective To evaluate the techniques of separating, fusing, opacifying and falsecoloring- volume rendering( SFOF-VR)3D imaging on the bone and blood vessels in the region of atlantoaxial joint(AAJ). Methods SFOF-VR 3D imaging was performed on 35 cases, including normal (n = 6),variations and lesions( n =29), which were selected from cases with the head-neck CTA examination. With the original scanning data, the VR imaging was performed, then SFOF-VR imaging. Comparisons were made between the features of 3D images of SFOF-VR and VR in showing the anatomy, diagnosing the variation and lesion of AAJ and VA, and the results were analyzed by using the Fisher exact test. Results The results of 35 cases included 6 normal cases in the region of atlantoaxial joint and VA, 16 variations in atlantoaxial joint or VA, 6 cases with arteriosclerosis in VA and 7 cases with fracture or dislocation of atlantoaxial joint. All SFOF-VR imaging are satisfactory. SFOF-VR imaging can show the atlas, epistropheus and VA independently or jointly, cut or color the structures freely and get 3D measurements in any direction.Comparisons showed that SFOF-VR images were much clearer and more comprehensive than VR in displaying the anatomy, variation and lesions of AAJ and VA. Statistical differences were found in showing the spatial structure, blocking structure, space measurement, variation and disease and image edge ( there are25,7,3,0, 31,3,1,0, 26,3,6,0, 23,7,5,0, 0,10,20,5 cases for SFOF-VR image with excellent,good, ordinary and poor quality, and 2,5,24,4, 0,2,8,25, 0,7,25,3, 5,6,23,1, 29,4,2,0 cases for VR;χ2 values 40. 259, 61.444, 42.245, 24.220, 51.299, P<0. 01 ). Conclusions SFOF-VR is a new 3D imaging technique which can clearly and directly show the bones and blood vessels in the region of AAJ.It can provide anatomical information for imaging diagnosis and surgical operation.